diff --git a/pkgs/by-name/pe/petsc/package.nix b/pkgs/by-name/pe/petsc/package.nix
index 5645677df27d..c83df800ca11 100644
--- a/pkgs/by-name/pe/petsc/package.nix
+++ b/pkgs/by-name/pe/petsc/package.nix
@@ -42,49 +42,64 @@ stdenv.mkDerivation rec {
     gfortran
     pkg-config
   ] ++ lib.optional mpiSupport mpi;
-  buildInputs = [
-    blas
-    lapack
-  ] ++ lib.optional hdf5-support hdf5 ++ lib.optional petsc-withp4est p4est ++ lib.optionals withParmetis [ metis parmetis ];
+  buildInputs =
+    [
+      blas
+      lapack
+    ]
+    ++ lib.optional hdf5-support hdf5
+    ++ lib.optional petsc-withp4est p4est
+    ++ lib.optionals withParmetis [
+      metis
+      parmetis
+    ];
 
-  postPatch = ''
-    patchShebangs ./lib/petsc/bin
-  '' + lib.optionalString stdenv.hostPlatform.isDarwin ''
-    substituteInPlace config/install.py \
-      --replace /usr/bin/install_name_tool ${cctools}/bin/install_name_tool
-  '';
+  postPatch =
+    ''
+      patchShebangs ./lib/petsc/bin
+    ''
+    + lib.optionalString stdenv.hostPlatform.isDarwin ''
+      substituteInPlace config/install.py \
+        --replace /usr/bin/install_name_tool ${cctools}/bin/install_name_tool
+    '';
 
-  configureFlags = [
-    "--with-blas=1"
-    "--with-lapack=1"
-    "--with-scalar-type=${petsc-scalar-type}"
-    "--with-precision=${petsc-precision}"
-    "--with-mpi=${if mpiSupport then "1" else "0"}"
-  ] ++ lib.optionals mpiSupport [
-    "--CC=mpicc"
-    "--with-cxx=mpicxx"
-    "--with-fc=mpif90"
-  ] ++ lib.optionals (mpiSupport && withParmetis) [
-    "--with-metis=1"
-    "--with-metis-dir=${metis}"
-    "--with-parmetis=1"
-    "--with-parmetis-dir=${parmetis}"
-  ] ++ lib.optionals petsc-withp4est [
-    "--with-p4est=1"
-    "--with-zlib-include=${zlib.dev}/include"
-    "--with-zlib-lib=[-L${zlib}/lib,-lz]"
-  ] ++ lib.optionals hdf5-support [
-    "--with-hdf5=1"
-    "--with-hdf5-fortran-bindings=1"
-    "--with-hdf5-include=${hdf5.dev}/include"
-    "--with-hdf5-lib=[-L${hdf5}/lib,-lhdf5]"
-  ] ++ lib.optionals petsc-optimized [
-    "--with-debugging=0"
-    "COPTFLAGS=-O3"
-    "FOPTFLAGS=-O3"
-    "CXXOPTFLAGS=-O3"
-    "CXXFLAGS=-O3"
-  ];
+  configureFlags =
+    [
+      "--with-blas=1"
+      "--with-lapack=1"
+      "--with-scalar-type=${petsc-scalar-type}"
+      "--with-precision=${petsc-precision}"
+      "--with-mpi=${if mpiSupport then "1" else "0"}"
+    ]
+    ++ lib.optionals mpiSupport [
+      "--CC=mpicc"
+      "--with-cxx=mpicxx"
+      "--with-fc=mpif90"
+    ]
+    ++ lib.optionals (mpiSupport && withParmetis) [
+      "--with-metis=1"
+      "--with-metis-dir=${metis}"
+      "--with-parmetis=1"
+      "--with-parmetis-dir=${parmetis}"
+    ]
+    ++ lib.optionals petsc-withp4est [
+      "--with-p4est=1"
+      "--with-zlib-include=${zlib.dev}/include"
+      "--with-zlib-lib=[-L${zlib}/lib,-lz]"
+    ]
+    ++ lib.optionals hdf5-support [
+      "--with-hdf5=1"
+      "--with-hdf5-fortran-bindings=1"
+      "--with-hdf5-include=${hdf5.dev}/include"
+      "--with-hdf5-lib=[-L${hdf5}/lib,-lhdf5]"
+    ]
+    ++ lib.optionals petsc-optimized [
+      "--with-debugging=0"
+      "COPTFLAGS=-O3"
+      "FOPTFLAGS=-O3"
+      "CXXOPTFLAGS=-O3"
+      "CXXFLAGS=-O3"
+    ];
 
   hardeningDisable = lib.optionals (!petsc-optimized) [
     "fortify"